High-pressure phase behavior of tri-ethylene glycol dimethacrylate and tetra-ethylene glycol dimethacrylate in supercritical carbon dioxide

In this study, high-pressure phase behavior data, the pressure-composition (P-x) isotherms for the CO2 + T3EGDMA and CO2 + T4EGDMA binary mixture system, were measured using the static method with a variable-volume view cell at temperatures ranging from 313.2 to 363.2 K. The experimental data correlation was performed using the Peng–Robinson Equation of State (PR-EOS) and the van der Waals one-fluid mixing rule. The critical constants for the PR-EOS were estimated using the several group contributions. The acentric factor was estimated using the Lee–Kesler method. The Joback method shows the better correlation results than the others.

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► High pressure phase behavior of T3EGDMA and T4EGDMA in scCO2 was measured.
► The experimental data correlation was performed using the PR-EOS.
► Tc and Pc were estimated using the several group contribution methods.
► The acentric factor was estimated using Lee–Kesler method.
► The Joback method and Lee–Kesler method shows the best correlation result.